Light aggregate cell concrete self-insulating building block and preparation method thereof

A self-insulating block and concrete technology, which is applied in ceramic products, other household appliances, sustainable waste treatment, etc., can solve the problems of easy cracking on the surface of hardened microporous concrete, high water storage rate and high water absorption rate of the insulation layer, etc. , to achieve good self-curing effect, reduce shrinkage, and reduce drying shrinkage

Active Publication Date: 2014-05-07
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] On the one hand, in the production of microporous concrete, in order to improve its strength, it is often required to use a large amount of cement (generally, the amount of cement accounts for 50% to 100% of the total dry material), high-grade cement, which makes hardening The surface of microporous concrete is prone to cracking, which makes the price higher; on the other hand, in order to meet the workability of its construction requirements, the water consumption of microporous concrete is much l

Method used

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  • Light aggregate cell concrete self-insulating building block and preparation method thereof
  • Light aggregate cell concrete self-insulating building block and preparation method thereof
  • Light aggregate cell concrete self-insulating building block and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A light-grain microporous concrete self-insulating block, which is prepared from the following raw materials according to mass percentage: 30% cement, 20% industrial waste admixture, 20% light industrial waste granules, 25% water, and 1.0% composite admixture , Foaming agent 0.3%.

[0034] Among them, the cement is P·Ⅱ52.5 grade Portland cement, and its performance meets the requirements of GB175-2007 "General Portland Cement". The industrial waste admixture is fly ash, the sieve fineness of fly ash 45μm is ≤45%, the activity index is ≥70%, and the performance meets the requirements of GB / T1596-2005 "Fly Ash Used in Cement and Concrete". The light particles of industrial waste are autoclaved aerated concrete fine particles, through mechanical crushing and screening, the particle size is 0.1~10mm, and the bulk density is ≤800kg / m 3 , when used, make it into a saturated face-dry state. The composite admixture includes 20% by mass of water reducing agent, 50% of foam sta...

Embodiment 2

[0041] The raw materials are prepared according to the following mass percentages: 25% cement, 20% industrial waste admixture, 25% light industrial waste granules, 27% water, 1.5% composite admixture, and 0.25% foaming agent.

[0042] Wherein, cement, industrial waste slag light grain are the same as embodiment 1. The industrial waste slag admixture is steel slag powder, and its specific surface area is ≥ 400m 2 / kg, activity index ≥ 75%, and its performance meets the requirements of GB / T20491-2006 "Steel Slag Powder Used in Cement and Concrete". The composite admixture includes 25% water reducing agent, 40% foam stabilizer and 35% water repellent by mass percentage. The foaming agent is a vegetable protein foaming agent, and it is diluted with water at a mass ratio of 1:60 when making foam.

[0043] The preparation steps are the same as in Example 1.

Embodiment 3

[0045] The raw materials are prepared according to the following mass percentages: cement 25%, industrial waste slag admixture 15%, industrial waste light granules 30%, water 29%, composite admixture 2.5%, foaming agent 0.2% + air-entraining agent 0.05%.

[0046] Wherein, cement, industrial waste slag admixture, and industrial waste slag light grains are the same as in Example 1. The composite admixture includes 30% water reducing agent, 45% foam stabilizer and 25% water repellent by mass percentage. The foaming agent is a vegetable protein foaming agent, and it is diluted with water at a mass ratio of 1:80 when making foam. The air-entraining agent is sodium lauryl sulfate (K12), which is a white to light yellow powder with good emulsifying, foaming, penetrating, decontaminating and dispersing properties.

[0047] The preparation steps are the same as in Example 1.

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Abstract

The invention discloses a light aggregate cell concrete self-insulating building block and a preparation method thereof. The building brick is prepared by dosing, stirring, mixing, foaming, injecting and moulding, maintaining and hardening the following components in percentage by weight: 25-30% of cement, 10-20% of industrial residue admixtures, 20-35% of industrial residue aggregates, 25-30% of water, 1.0-3.5% of a compound additive and 0.1-0.3% of a foamer. The light aggregate cell concrete self-insulating building block prepared by the method disclosed by the invention is high in strength and low in density, wherein the apparent density is 500-1200kg/m<3>, the compressive strength is 3.5-15.0MPa, and the heat conductivity coefficient is 0.08-0.25W/(m.K). The building brick has good fireproof and flame retardant performances as well as heat-preserving and heat-insulating properties, and satisfies the demand of national energy conservation by 65%. Meanwhile, a plenty of industrial residue light aggregates are utilized, so that cement is saved, thereby facilitating energy conservation and emission reduction and maintenance of the ecological environment.

Description

Technical field [0001] The present invention belongs to the field of civil engineering materials, involving a light -grained microporous concrete self -insulation block and its preparation method. [0002] Background technique [0003] Micro -hole concrete (foam concrete, air -citing concrete), because it contains a large number of closed pores, shows good physical mechanical properties and use functions, has the advantages of light quality, durability, good overallness, and fast construction speed.In recent years, it has been widely used in the construction market.However, at present, the micro -hole concrete still has problems such as low strength, excessive water absorption, and excessive shrinkage during the application process.The reason is that micro -holes concrete introduced a large amount of bubbles during production, and the raw materials are mainly powder and fine particles, which shows a high contraction rate in performance. The cracking phenomenon is common.Essence ...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B38/02C04B18/30
CPCY02W30/91
Inventor 秦鸿根庞超明耿帅帅陶有华
Owner SOUTHEAST UNIV
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